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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.13 02-Aug-2011  Version 8.31
5    -----------------------------
7    1.  Fixing a wrong JIT test case and some compiler warnings.
9    2.  Removed a bashism from the RunTest script.
11    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
12        to unsigned type, result still unsigned" that was given by an MS compiler
13        on encountering the code "-sizeof(xxx)".
15    4.  Partial matching support is added to the JIT compiler.
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
20        (a) /^(..)\1/ did not partially match "aba" because checking references was
21            done on an "all or nothing" basis. This also applied to repeated
22            references.
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
33        (e) When newline was set to CRLF, the metacharacter "." did not recognize
34            a partial match for a CR character at the end of the subject string.
36    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
37        running pcretest, the text "(JIT)" added to the output whenever JIT is
38        actually used to run the match.
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
45    9.  (*MARK) control verb is now supported by the JIT compiler.
47    10. The command "./RunTest list" lists the available tests without actually
48        running any of them. (Because I keep forgetting what they all are.)
52    12. Applied a (slightly modified) user-supplied patch that improves performance
53        when the heap is used for recursion (compiled with --disable-stack-for-
54        recursion). Instead of malloc and free for each heap frame each time a
55        logical recursion happens, frames are retained on a chain and re-used where
56        possible. This sometimes gives as much as 30% improvement.
58    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
68    17. The Unicode data tables have been updated to Unicode 6.1.0.
70    18. Added --file-list option to pcregrep.
72    19. Added binary file support to pcregrep, including the -a, --binary-files,
73        -I, and --text options.
75    20. The madvise function is renamed for posix_madvise for QNX compatibility
76        reasons. Fixed by Giuseppe D'Angelo.
78    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
80    22. Changed the option for creating symbolic links for 16-bit man pages from
81        -s to -sf so that re-installing does not cause issues.
83    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
85    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
86        matches in certain environments (the workspace was not being correctly
87        retained). Also added to pcre_dfa_exec() a simple plausibility check on
88        some of the workspace data at the beginning of a restart.
90    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
91        was not doing so when it should - probably a typo introduced by SVN 528
92        (change 8.10/14).
94    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
95        \w+ when the character tables indicated that \x{c4} was a word character.
96        There were several related cases, all because the tests for doing a table
97        lookup were testing for characters less than 127 instead of 255.
99    27. If a pattern contains capturing parentheses that are not used in a match,
100        their slots in the ovector are set to -1. For those that are higher than
101        any matched groups, this happens at the end of processing. In the case when
102        there were back references that the ovector was too small to contain
103        (causing temporary malloc'd memory to be used during matching), and the
104        highest capturing number was not used, memory off the end of the ovector
105        was incorrectly being set to -1. (It was using the size of the temporary
106        memory instead of the true size.)
108    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
109        ovector size, it uses memory at the end of the block that it has got.
111    29. Check for an overlong MARK name and give an error at compile time. The
112        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
114    30. JIT compiler update.
116    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
117        Rill for the patch.
119    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
121    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
124    Version 8.30 04-February-2012
125    -----------------------------
127    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
128        name is defined in ctype.h.
130    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
131        only in quite long subpatterns.
133    3.  Removed the function pcre_info(), which has been obsolete and deprecated
134        since it was replaced by pcre_fullinfo() in February 2000.
136    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
137        match a (*MARK), and the match failed at the start of the subject, a
138        reference to memory before the start of the subject could occur. This bug
139        was introduced by fix 17 of release 8.21.
141    5.  A reference to an unset group with zero minimum repetition was giving
142        totally wrong answers (in non-JavaScript-compatibility mode). For example,
143        /(another)?(\1?)test/ matched against "hello world test". This bug was
144        introduced in release 8.13.
146    6.  Add support for 16-bit character strings (a large amount of work involving
147        many changes and refactorings).
149    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
150        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
151        from a file.
153    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
154        rounding is not applied in this particular case).
156    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
157        if they appear, or are escaped, in patterns.
159    10. Get rid of a number of -Wunused-but-set-variable warnings.
161    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
162        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
163        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
164        also returns the mark "x". This bug applied to capturing parentheses,
165        non-capturing parentheses, and atomic parentheses. It also applied to some
166        assertions.
168    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
169        information out of configure.ac instead of relying on pcre.h.generic, which
170        is not stored in the repository.
172    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
173        -lreadline.
175    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
177    15. Applied Graycode's patch to put the top-level frame on the stack rather
178        than the heap when not using the stack for recursion. This gives a
179        performance improvement in many cases when recursion is not deep.
181    16. Experimental code added to "pcretest -C" to output the stack frame size.
184    Version 8.21 12-Dec-2011
185    ------------------------
187    1.  Updating the JIT compiler.
189    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
190        are added as well.
192    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
193        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
194        calling _pcre_jit_exec. Some extra comments are added.
196    4.  (*MARK) settings inside atomic groups that do not contain any capturing
197        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
198        was introduced by change 18 for 8.20.
200    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
201        ECMA-262 standard.
203    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
204        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
205        This bug was probably introduced by change 9 of 8.13.
207    7.  While fixing 6 above, I noticed that a number of other items were being
208        incorrectly rejected as "not fixed length". This arose partly because newer
209        opcodes had not been added to the fixed-length checking code. I have (a)
210        corrected the bug and added tests for these items, and (b) arranged for an
211        error to occur if an unknown opcode is encountered while checking for fixed
212        length instead of just assuming "not fixed length". The items that were
213        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
214        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
215        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
217    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
218        being incorrectly compiled and would have given unpredicatble results.
220    9.  A possessively repeated subpattern with minimum repeat count greater than
221        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
222        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
223        the first (A) could occur when it should not.
225    10. Add a cast and remove a redundant test from the code.
227    11. JIT should use pcre_malloc/pcre_free for allocation.
229    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
230        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
231        is anything other than /usr, -L is still shown).
233    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
235    14. Perl does not support \N without a following name in a [] class; PCRE now
236        also gives an error.
238    15. If a forward reference was repeated with an upper limit of around 2000,
239        it caused the error "internal error: overran compiling workspace". The
240        maximum number of forward references (including repeats) was limited by the
241        internal workspace, and dependent on the LINK_SIZE. The code has been
242        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
243        the default depends on LINK_SIZE. There is a new upper limit (for safety)
244        of around 200,000 forward references. While doing this, I also speeded up
245        the filling in of repeated forward references.
247    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
248        incorrectly expecting the subject to contain another "a" after the start.
250    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
251        in the match, the SKIP should be ignored. This was not happening; instead
252        the SKIP was being treated as NOMATCH. For patterns such as
253        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
254        tested.
256    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
257        now much more compatible with Perl, in particular in cases where the result
258        is a non-match for a non-anchored pattern. For example, if
259        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
260        "m", where previously it did not return a name. A side effect of this
261        change is that for partial matches, the last encountered mark name is
262        returned, as for non matches. A number of tests that were previously not
263        Perl-compatible have been moved into the Perl-compatible test files. The
264        refactoring has had the pleasing side effect of removing one argument from
265        the match() function, thus reducing its stack requirements.
267    19. If the /S+ option was used in pcretest to study a pattern using JIT,
268        subsequent uses of /S (without +) incorrectly behaved like /S+.
270    21. Retrieve executable code size support for the JIT compiler and fixing
271        some warnings.
273    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
274        not work when the shorter character appeared right at the end of the
275        subject string.
277    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
278        systems.
280    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
281        output it when the /M option is used in pcretest.
283    25. The CheckMan script was not being included in the distribution. Also, added
284        an explicit "perl" to run Perl scripts from the PrepareRelease script
285        because this is reportedly needed in Windows.
287    26. If study data was being save in a file and studying had not found a set of
288        "starts with" bytes for the pattern, the data written to the file (though
289        never used) was taken from uninitialized memory and so caused valgrind to
290        complain.
292    27. Updated RunTest.bat as provided by Sheri Pierce.
294    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
296    29. Computation of memory usage for the table of capturing group names was
297        giving an unnecessarily large value.
300    Version 8.20 21-Oct-2011
301    ------------------------
303    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
304        a POSIX class. After further experiments with Perl, which convinced me that
305        Perl has bugs and confusions, a closing square bracket is no longer allowed
306        in a POSIX name. This bug also affected patterns with classes that started
307        with full stops.
309    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
310        captured substring, but while checking the failing first alternative,
311        substring 1 is temporarily captured. If the output vector supplied to
312        pcre_exec() was not big enough for this capture, the yield of the function
313        was still zero ("insufficient space for captured substrings"). This cannot
314        be totally fixed without adding another stack variable, which seems a lot
315        of expense for a edge case. However, I have improved the situation in cases
316        such as /(a)(b)x|abc/ matched against "abc", where the return code
317        indicates that fewer than the maximum number of slots in the ovector have
318        been set.
320    3.  Related to (2) above: when there are more back references in a pattern than
321        slots in the output vector, pcre_exec() uses temporary memory during
322        matching, and copies in the captures as far as possible afterwards. It was
323        using the entire output vector, but this conflicts with the specification
324        that only 2/3 is used for passing back captured substrings. Now it uses
325        only the first 2/3, for compatibility. This is, of course, another edge
326        case.
328    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
329        main code base, and can be used by building with --enable-jit. When this is
330        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
331        runtime --no-jit option is given.
333    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
334        ovector, the return from the function was zero, implying that there were
335        other matches that did not fit. The correct "exactly full" value is now
336        returned.
338    6.  If a subpattern that was called recursively or as a subroutine contained
339        (*PRUNE) or any other control that caused it to give a non-standard return,
340        invalid errors such as "Error -26 (nested recursion at the same subject
341        position)" or even infinite loops could occur.
343    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
344        computing the minimum length on reaching *ACCEPT, and so ended up with the
345        wrong value of 1 rather than 0. Further investigation indicates that
346        computing a minimum subject length in the presence of *ACCEPT is difficult
347        (think back references, subroutine calls), and so I have changed the code
348        so that no minimum is registered for a pattern that contains *ACCEPT.
350    8.  If (*THEN) was present in the first (true) branch of a conditional group,
351        it was not handled as intended. [But see 16 below.]
353    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
354        Sheri Pierce.
356    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
357        the first byte in a match must be "a".
359    11. Change 17 for 8.13 increased the recursion depth for patterns like
360        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
361        pattern contains any instances of (*THEN). If it does not, the old
362        optimizations are restored. It would be nice to do this on a per-group
363        basis, but at the moment that is not feasible.
365    12. In some environments, the output of pcretest -C is CRLF terminated. This
366        broke RunTest's code that checks for the link size. A single white space
367        character after the value is now allowed for.
369    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
370        For "fr", it uses the Windows-specific input and output files.
372    14. If (*THEN) appeared in a group that was called recursively or as a
373        subroutine, it did not work as intended. [But see next item.]
375    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
376        pattern fragments (but not containing any | characters). If A and B are
377        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
378        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
379        D. In other words, Perl considers parentheses that do not contain any |
380        characters to be part of a surrounding alternative, whereas PCRE was
381        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
382        differently. PCRE now behaves in the same way as Perl, except in the case
383        of subroutine/recursion calls such as (?1) which have in any case always
384        been different (but PCRE had them first :-).
386    16. Related to 15 above: Perl does not treat the | in a conditional group as
387        creating alternatives. Such a group is treated in the same way as an
388        ordinary group without any | characters when processing (*THEN). PCRE has
389        been changed to match Perl's behaviour.
391    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
392        RunGrepTest script failed.
394    18. Change 22 for version 13 caused atomic groups to use more stack. This is
395        inevitable for groups that contain captures, but it can lead to a lot of
396        stack use in large patterns. The old behaviour has been restored for atomic
397        groups that do not contain any capturing parentheses.
399    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
400        suppress the check for a minimum subject length at run time. (If it was
401        given to pcre_exec() or pcre_dfa_exec() it did work.)
403    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
404        fail to work when decoding hex characters in data strings in EBCDIC
405        environments.
407    21. It appears that in at least one Mac OS environment, the isxdigit() function
408        is implemented as a macro that evaluates to its argument more than once,
409        contravening the C 90 Standard (I haven't checked a later standard). There
410        was an instance in pcretest which caused it to go wrong when processing
411        \x{...} escapes in subject strings. The has been rewritten to avoid using
412        things like p++ in the argument of isxdigit().
415    Version 8.13 16-Aug-2011
416  ------------------------  ------------------------
418  1.  The Unicode data tables have been updated to Unicode 6.0.0.  1.  The Unicode data tables have been updated to Unicode 6.0.0.
# Line 98  Version 8.13 02-Aug-2011 Line 509  Version 8.13 02-Aug-2011
509      tail recursion to cut down on stack usage. Unfortunately, now that there is      tail recursion to cut down on stack usage. Unfortunately, now that there is
510      the possibility of (*THEN) occurring in these branches, tail recursion is      the possibility of (*THEN) occurring in these branches, tail recursion is
511      no longer possible because the return has to be checked for (*THEN). These      no longer possible because the return has to be checked for (*THEN). These
512      two optimizations have therefore been removed.      two optimizations have therefore been removed. [But see 8.20/11 above.]
514  18. If a pattern containing \R was studied, it was assumed that \R always  18. If a pattern containing \R was studied, it was assumed that \R always
515      matched two bytes, thus causing the minimum subject length to be      matched two bytes, thus causing the minimum subject length to be
# Line 189  Version 8.13 02-Aug-2011 Line 600  Version 8.13 02-Aug-2011
600      For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,      For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
601      unescaped square brackets may also appear as part of class names. For      unescaped square brackets may also appear as part of class names. For
602      example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves      example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
603      more like Perl.      more like Perl. (But see 8.20/1 above.)
605  38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this  38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
606      was because it thought it was \N{name}, which is not supported).      was because it thought it was \N{name}, which is not supported).
# Line 224  Version 8.13 02-Aug-2011 Line 635  Version 8.13 02-Aug-2011
635      (a) The default value of the buffer size parameter has been increased from      (a) The default value of the buffer size parameter has been increased from
636          8K to 20K. (The actual buffer used is three times this size.)          8K to 20K. (The actual buffer used is three times this size.)
638      (b) The default can be changed by ./configure --with-pcregrep-bufsiz when      (b) The default can be changed by ./configure --with-pcregrep-bufsize when
639          PCRE is built.          PCRE is built.
641      (c) A --buffer-size=n option has been added to pcregrep, to allow the size      (c) A --buffer-size=n option has been added to pcregrep, to allow the size
# Line 245  Version 8.13 02-Aug-2011 Line 656  Version 8.13 02-Aug-2011
656  47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a  47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
657      complete match instead of a partial match. This bug was dependent on both      complete match instead of a partial match. This bug was dependent on both
658      the PCRE_UTF8 and PCRE_DOTALL options being set.      the PCRE_UTF8 and PCRE_DOTALL options being set.
660  48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the  48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
661      starting byte set, because \b was not being ignored.      starting byte set, because \b was not being ignored.
664  Version 8.12 15-Jan-2011  Version 8.12 15-Jan-2011

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